I am not experiencing this. I think the other factor you might be overlooking is that the common factor here is you. I have tried replicating your issue but cannot.

Obviously when you hold your finger on the screen in some applications (like Mail) it will naturally bring up the magnifying glass as it should since you have indicated that you need closer detail on some text (by, you know, holding your finger on the screen). Where there isn't any text or clickable object, holding a finger on the screen does nothing (like on the desktop when not pointing to an icon, for example).